Perlindungan hukum bagi pembeli lelang berobjek tanah dalam sengketa perdata (studi kasus putusan Mahkamah Agung nomor 300 pk/pdt/2009) = Legal protection for a purchaser buying a plot of land through an auction in the civil dispute (case study on supreme court decision no 300 pk pdt 2009) / Elizabeth Taruli Lestari Lubis